21334220 has 24 divisors (see below), whose sum is σ = 45042144. Its totient is φ = 8487936.

The previous prime is 21334219. The next prime is 21334241. The reversal of 21334220 is 2243312.

It is a plaindrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1097 + ... + 6623.

It is an arithmetic number, because the mean of its divisors is an integer number (1876756).

Almost surely, 2^21334220 is an apocalyptic number.

21334220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21334220 is an abundant number, since it is smaller than the sum of its proper divisors (23707924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21334220 is a wasteful number, since it uses less digits than its factorization.

21334220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5729 (or 5727 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 21334220 is about 4618.8981370019. The cubic root of 21334220 is about 277.3483520641.

Adding to 21334220 its reverse (2243312), we get a palindrome (23577532).

The spelling of 21334220 in words is "twenty-one million, three hundred thirty-four thousand, two hundred twenty".